{"id":"79b2fdac-d29c-4f2e-baaa-2a1f8b539fc0","shortId":"H3n2Nt","kind":"x402","title":"Pay-per-request API platform on Base via x402 — $0.02/call, no API keys required.","tagline":"Pay-per-request API platform on Base via x402 — $0.02/call, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and utility services. All endpoints are paid per-request using USDC on the Base network via the x402 protocol, with no API keys, rate limits, or upfront commitments required.\n\nThe specific endpoint at `/api/v1/products/34` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. Payment is made via the x402 exact scheme to the specified wallet address. The endpoint accepts POST requests and returns application/json.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 per request price point. However, documentation is extremely sparse: the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The actual functionality behind `/api/v1/products/34` (\"Premium API Access\") is unclear — it could be a generic product endpoint or a meta-endpoint. Without documentation or example responses, the precise behavior must be discovered by making a paid request.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","no-api-key","json-response","post-method"],"categories":["api-platform","infrastructure"],"synonyms":["pay-per-call API","x402 API","micropayment API","USDC API access","Base network API","lowpaymentfee","crypto-paid API"],"warnings":["No API documentation available — docs, pricing, and README pages all render only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific functionality of /api/v1/products/34 ('Premium API Access') is undocumented and unclear","No example request or response payloads available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/34","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/products/34","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it works. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and no examples. The actual functionality of this specific endpoint is unclear. The docs/pricing/README pages are all empty (just 'Connect 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'/call':12,28 '0.02':11,27,108,168 '000':103 '20':102 '402':97 '6':113 'Base network API' 'USDC API access' 'accept':132 'access':93,221 'across':47 'actual':215 'address':129 'advertis':141 'ai/ml':50 'analysi':145 'analyt':49 'api':5,14,21,30,39,75,92,180,220 'application/json':137 'avail':209 'base':8,24,67,104,116 'behavior':243 'behind':217 'broader':139 'challeng':98 'classif':148 'commit':81 'connect':189 'content':195 'convers':160 'could':225 'crawl':212 'crypto-paid API' 'data':48,162 'decim':114 'discov':246 'doc':179 'document':174,204,237 'embed':149 'enabl':38 'endpoint':46,57,85,131,142,230,235 'estim':157 'exact':123 'exampl':208,239 'exchang':152 'extrem':176 'feed':151 'finance/web3':52 'function':216 'gas':156 'generat':163 'generic':228 'geocod':158 'howev':173 'infer':51 'json-response' 'key':15,31,76 'limit':78 'list':89 'lowpaymentfee' 'lowpaymentfee.com':33 'made':119 'make':248 'materi':213 'meta':234 'meta-endpoint':233 'micropayment API' 'must':244 'network':68 'no-api-key' 'offer':42 'openapi':199 'page':184 'paid':59,250 'pay':2,18 'pay-per-call API' 'pay-per-request':1,17 'payment':117 'per':3,19,61,169 'per-request':60 'per-request-billing' 'platform':6,22,40,140 'point':172 'post':133 'post-method' 'precis':242 'premium':91,219 'price':150,171,181 'product':229 'prompt':191 'protocol':72 'quot':155 'rate':77,153 'readm':183 'render':186 'request':4,20,62,99,134,170,251 'request/response':202 'requir':16,32,82 'respons':240 'return':95,136 'schema':203 'scheme':124 'sentiment':144 'servic':55 'sinc':110 'spars':177 'spec':200 'specif':84 'specifi':127 'substant':194 'summar':147 'text':146 'token':154 'unclear':223 'unit':105 'upfront':80 'usag':207 'usd':109 'usdc':64,107,111 'usdc-base' 'use':63,112 'util':54 'valid':159 'varieti':44 'via':9,25,69,120 'wallet':128,190 'without':236 'x402':10,26,37,71,122 'x402 API' 'x402-enabled':36 'x402-payment'","prices":[{"id":"2475b9cf-19a6-4354-bb69-2821e732032c","listingId":"79b2fdac-d29c-4f2e-baaa-2a1f8b539fc0","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/products/34","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:41.500Z"}],"sources":[{"listingId":"79b2fdac-d29c-4f2e-baaa-2a1f8b539fc0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/34","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:41.500Z","lastSeenAt":"2026-04-25T01:32:01.646Z"}],"details":{"listingId":"79b2fdac-d29c-4f2e-baaa-2a1f8b539fc0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/34 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge requests maxAmountRequired of 20000 base units of USDC on Base (= $0.02)","source_url":"https://lowpaymentfee.com/api/v1/products/34"},{"claim":"Payment asset is USDC at contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/products/34"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without needing to register or manage API keys","Making one-off paid API calls from autonomous agents using x402 on Base","Integrating pay-as-you-go API access into Web3 applications"],"bestFor":["Agents or apps that need keyless, pay-per-request API access","Developers who want to avoid subscription commitments for occasional API calls","Web3-native applications already operating on the Base network"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","High-volume use cases where per-request pricing at $0.02 may add up compared to bulk plans","Anyone without access to USDC on Base for payment"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:47.022Z"},"updatedAt":"2026-04-25T01:32:01.646Z"}}